940 lines
33 KiB
Scheme
940 lines
33 KiB
Scheme
;;; GNU Guix --- Functional package management for GNU
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;;; Copyright © 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021 Ludovic Courtès <ludo@gnu.org>
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;;; Copyright © 2013, 2014, 2015 Mark H Weaver <mhw@netris.org>
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;;; Copyright © 2014 Eric Bavier <bavier@member.fsf.org>
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;;; Copyright © 2014 Ian Denhardt <ian@zenhack.net>
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;;; Copyright © 2016 Mathieu Lirzin <mthl@gnu.org>
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;;; Copyright © 2015 David Thompson <davet@gnu.org>
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;;; Copyright © 2017 Mathieu Othacehe <m.othacehe@gmail.com>
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;;; Copyright © 2018, 2020 Marius Bakke <marius@gnu.org>
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;;; Copyright © 2020 Efraim Flashner <efraim@flashner.co.il>
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;;; Copyright © 2021 Simon Tournier <zimon.toutoune@gmail.com>
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;;; Copyright © 2021 Chris Marusich <cmmarusich@gmail.com>
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;;;
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;;; This file is part of GNU Guix.
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;;;
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;;; GNU Guix is free software; you can redistribute it and/or modify it
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;;; under the terms of the GNU General Public License as published by
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;;; the Free Software Foundation; either version 3 of the License, or (at
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;;; your option) any later version.
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;;;
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;;; GNU Guix is distributed in the hope that it will be useful, but
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;;; WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;; GNU General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU General Public License
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;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
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(define-module (guix utils)
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#:use-module (guix config)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-9)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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#:use-module (srfi srfi-39)
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#:use-module (ice-9 ftw)
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#:use-module (rnrs io ports) ;need 'port-position' etc.
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#:use-module ((rnrs bytevectors) #:select (bytevector-u8-set!))
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#:use-module (guix memoization)
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#:use-module ((guix build utils) #:select (dump-port mkdir-p delete-file-recursively))
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#:use-module ((guix build syscalls) #:select (mkdtemp! fdatasync))
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#:use-module ((guix combinators) #:select (fold2))
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#:use-module (guix diagnostics) ;<location>, &error-location, etc.
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#:use-module (ice-9 format)
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#:use-module (ice-9 regex)
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#:use-module (ice-9 match)
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#:use-module (ice-9 format)
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#:use-module ((ice-9 iconv) #:prefix iconv:)
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#:autoload (zlib) (make-zlib-input-port make-zlib-output-port)
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#:use-module (system foreign)
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#:re-export (<location> ;for backwards compatibility
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location
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location?
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location-file
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location-line
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location-column
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source-properties->location
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location->source-properties
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&error-location
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error-location?
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error-location
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&fix-hint
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fix-hint?
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condition-fix-hint)
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#:export (strip-keyword-arguments
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default-keyword-arguments
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substitute-keyword-arguments
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ensure-keyword-arguments
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current-source-directory
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nix-system->gnu-triplet
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gnu-triplet->nix-system
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%current-system
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%current-target-system
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package-name->name+version
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target-mingw?
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target-arm32?
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target-aarch64?
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target-arm?
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target-powerpc?
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target-64bit?
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cc-for-target
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cxx-for-target
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pkg-config-for-target
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version-compare
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version>?
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version>=?
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version-prefix
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version-major+minor+point
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version-major+minor
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version-major
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version-unique-prefix
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guile-version>?
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version-prefix?
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string-replace-substring
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file-extension
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file-sans-extension
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tarball-sans-extension
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compressed-file?
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switch-symlinks
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call-with-temporary-output-file
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call-with-temporary-directory
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with-atomic-file-output
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with-environment-variables
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arguments-from-environment-variable
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config-directory
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cache-directory
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readlink*
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edit-expression
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filtered-port
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decompressed-port
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call-with-decompressed-port
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compressed-output-port
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call-with-compressed-output-port
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canonical-newline-port
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string-distance
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string-closest))
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;;;
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;;; Environment variables.
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;;;
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(define (call-with-environment-variables variables thunk)
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"Call THUNK with the environment VARIABLES set."
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(let ((environment (environ)))
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(dynamic-wind
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(lambda ()
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(for-each (match-lambda
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((variable value)
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(setenv variable value)))
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variables))
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thunk
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(lambda ()
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(environ environment)))))
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(define-syntax-rule (with-environment-variables variables exp ...)
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"Evaluate EXP with the given environment VARIABLES set."
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(call-with-environment-variables variables
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(lambda () exp ...)))
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(define (arguments-from-environment-variable variable)
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"Retrieve value of environment variable denoted by string VARIABLE in the
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form of a list of strings (`char-set:graphic' tokens) suitable for consumption
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by `args-fold', if VARIABLE is defined, otherwise return an empty list."
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(let ((env (getenv variable)))
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(if env
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(string-tokenize env char-set:graphic)
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'())))
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;;;
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;;; Filtering & pipes.
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;;;
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(define (filtered-port command input)
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"Return an input port where data drained from INPUT is filtered through
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COMMAND (a list). In addition, return a list of PIDs that the caller must
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wait. When INPUT is a file port, it must be unbuffered; otherwise, any
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buffered data is lost."
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(let loop ((input input)
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(pids '()))
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(if (file-port? input)
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(match (pipe)
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((in . out)
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #f)
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(lambda ()
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(close-port in)
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(close-port (current-input-port))
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(dup2 (fileno input) 0)
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(close-port (current-output-port))
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(dup2 (fileno out) 1)
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(catch 'system-error
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(lambda ()
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(apply execl (car command) command))
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(lambda args
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(format (current-error-port)
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"filtered-port: failed to execute '~{~a ~}': ~a~%"
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command (strerror (system-error-errno args))))))
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(lambda ()
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(primitive-_exit 1))))
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(child
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(close-port out)
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(values in (cons child pids))))))
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;; INPUT is not a file port, so fork just for the sake of tunneling it
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;; through a file port.
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(match (pipe)
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((in . out)
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #t)
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(lambda ()
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(close-port in)
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(dump-port input out))
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(lambda ()
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(close-port input)
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(false-if-exception (close out))
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(primitive-_exit 0))))
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(child
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(close-port input)
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(close-port out)
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(loop in (cons child pids)))))))))
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(define (lzip-port proc port . args)
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"Return the lzip port produced by calling PROC (a symbol) on PORT and ARGS.
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Raise an error if lzlib support is missing."
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(let ((make-port (module-ref (resolve-interface '(lzlib)) proc)))
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(make-port port)))
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(define (zstd-port proc port . args)
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"Return the zstd port produced by calling PROC (a symbol) on PORT and ARGS.
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Raise an error if zstd support is missing."
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(let ((make-port (module-ref (resolve-interface '(zstd)) proc)))
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(make-port port)))
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(define (decompressed-port compression input)
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"Return an input port where INPUT is decompressed according to COMPRESSION,
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a symbol such as 'xz."
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(match compression
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((or #f 'none) (values input '()))
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('bzip2 (filtered-port `(,%bzip2 "-dc") input))
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('xz (filtered-port `(,%xz "-dc") input))
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('gzip (values (make-zlib-input-port input #:format 'gzip)
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'()))
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('lzip (values (lzip-port 'make-lzip-input-port input)
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'()))
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('zstd (values (zstd-port 'make-zstd-input-port input)
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'()))
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(_ (error "unsupported compression scheme" compression))))
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(define (call-with-decompressed-port compression port proc)
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"Call PROC with a wrapper around PORT, a file port, that decompresses data
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read from PORT according to COMPRESSION, a symbol such as 'xz."
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(let-values (((decompressed pids)
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(decompressed-port compression port)))
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(dynamic-wind
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(const #f)
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(lambda ()
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(proc decompressed))
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(lambda ()
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(close-port decompressed)
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(unless (every (compose zero? cdr waitpid) pids)
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(error "decompressed-port failure" pids))))))
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(define (filtered-output-port command output)
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"Return an output port. Data written to that port is filtered through
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COMMAND and written to OUTPUT, an output file port. In addition, return a
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list of PIDs to wait for. OUTPUT must be unbuffered; otherwise, any buffered
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data is lost."
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(match (pipe)
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((in . out)
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(match (primitive-fork)
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(0
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(dynamic-wind
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(const #f)
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(lambda ()
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(close-port out)
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(close-port (current-input-port))
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(dup2 (fileno in) 0)
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(close-port (current-output-port))
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(dup2 (fileno output) 1)
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(catch 'system-error
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(lambda ()
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(apply execl (car command) command))
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(lambda args
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(format (current-error-port)
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"filtered-output-port: failed to execute '~{~a ~}': ~a~%"
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command (strerror (system-error-errno args))))))
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(lambda ()
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(primitive-_exit 1))))
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(child
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(close-port in)
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(values out (list child)))))))
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(define* (compressed-output-port compression output
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#:key (options '()))
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"Return an output port whose input is compressed according to COMPRESSION,
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a symbol such as 'xz, and then written to OUTPUT. In addition return a list
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of PIDs to wait for. OPTIONS is a list of strings passed to the compression
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program--e.g., '(\"--fast\")."
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(match compression
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((or #f 'none) (values output '()))
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('bzip2 (filtered-output-port `(,%bzip2 "-c" ,@options) output))
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('xz (filtered-output-port `(,%xz "-c" ,@options) output))
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('gzip (values (make-zlib-output-port output #:format 'gzip)
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'()))
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('lzip (values (lzip-port 'make-lzip-output-port output)
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'()))
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('zstd (values (zstd-port 'make-zstd-output-port output)
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'()))
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(_ (error "unsupported compression scheme" compression))))
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(define* (call-with-compressed-output-port compression port proc
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#:key (options '()))
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"Call PROC with a wrapper around PORT, a file port, that compresses data
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that goes to PORT according to COMPRESSION, a symbol such as 'xz. OPTIONS is
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a list of command-line arguments passed to the compression program."
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(let-values (((compressed pids)
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(compressed-output-port compression port
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#:options options)))
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(dynamic-wind
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(const #f)
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(lambda ()
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(proc compressed))
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(lambda ()
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(close-port compressed)
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(unless (every (compose zero? cdr waitpid) pids)
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(error "compressed-output-port failure" pids))))))
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(define* (edit-expression source-properties proc #:key (encoding "UTF-8"))
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"Edit the expression specified by SOURCE-PROPERTIES using PROC, which should
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be a procedure that takes the original expression in string and returns a new
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one. ENCODING will be used to interpret all port I/O, it default to UTF-8.
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This procedure returns #t on success."
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(with-fluids ((%default-port-encoding encoding))
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(let* ((file (assq-ref source-properties 'filename))
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(line (assq-ref source-properties 'line))
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(column (assq-ref source-properties 'column))
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(in (open-input-file file))
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;; The start byte position of the expression.
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(start (begin (while (not (and (= line (port-line in))
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(= column (port-column in))))
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(when (eof-object? (read-char in))
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(error (format #f "~a: end of file~%" in))))
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(ftell in)))
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;; The end byte position of the expression.
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(end (begin (read in) (ftell in))))
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(seek in 0 SEEK_SET) ; read from the beginning of the file.
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(let* ((pre-bv (get-bytevector-n in start))
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;; The expression in string form.
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(str (iconv:bytevector->string
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(get-bytevector-n in (- end start))
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(port-encoding in)))
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(post-bv (get-bytevector-all in))
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(str* (proc str)))
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;; Verify the edited expression is still a scheme expression.
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(call-with-input-string str* read)
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;; Update the file with edited expression.
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(with-atomic-file-output file
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(lambda (out)
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(put-bytevector out pre-bv)
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(display str* out)
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;; post-bv maybe the end-of-file object.
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(when (not (eof-object? post-bv))
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(put-bytevector out post-bv))
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#t))))))
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;;;
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;;; Keyword arguments.
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;;;
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(define (strip-keyword-arguments keywords args)
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"Remove all of the keyword arguments listed in KEYWORDS from ARGS."
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(let loop ((args args)
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(result '()))
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(match args
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(()
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(reverse result))
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(((? keyword? kw) arg . rest)
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(loop rest
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(if (memq kw keywords)
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result
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(cons* arg kw result))))
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((head . tail)
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(loop tail (cons head result))))))
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(define (default-keyword-arguments args defaults)
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"Return ARGS augmented with any keyword/value from DEFAULTS for
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keywords not already present in ARGS."
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(let loop ((defaults defaults)
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(args args))
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(match defaults
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((kw value rest ...)
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(loop rest
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(if (memq kw args)
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args
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(cons* kw value args))))
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(()
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args))))
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(define-syntax collect-default-args
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(syntax-rules ()
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((_)
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'())
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((_ (_ _) rest ...)
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(collect-default-args rest ...))
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((_ (kw _ dflt) rest ...)
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(cons* kw dflt (collect-default-args rest ...)))))
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(define-syntax substitute-keyword-arguments
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(syntax-rules ()
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"Return a new list of arguments where the value for keyword arg KW is
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replaced by EXP. EXP is evaluated in a context where VAR is bound to the
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previous value of the keyword argument, or DFLT if given."
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((_ original-args ((kw var dflt ...) exp) ...)
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(let loop ((args (default-keyword-arguments
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original-args
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(collect-default-args (kw var dflt ...) ...)))
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(before '()))
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(match args
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((kw var rest (... ...))
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(loop rest (cons* exp kw before)))
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...
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((x rest (... ...))
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(loop rest (cons x before)))
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(()
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(reverse before)))))))
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(define (delkw kw lst)
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"Remove KW and its associated value from LST, a keyword/value list such
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as '(#:foo 1 #:bar 2)."
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(let loop ((lst lst)
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(result '()))
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(match lst
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(()
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(reverse result))
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((kw? value rest ...)
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(if (eq? kw? kw)
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(append (reverse result) rest)
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(loop rest (cons* value kw? result)))))))
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(define (ensure-keyword-arguments args kw/values)
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"Force the keywords arguments KW/VALUES in the keyword argument list ARGS.
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For instance:
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(ensure-keyword-arguments '(#:foo 2) '(#:foo 2))
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=> (#:foo 2)
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(ensure-keyword-arguments '(#:foo 2) '(#:bar 3))
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=> (#:foo 2 #:bar 3)
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(ensure-keyword-arguments '(#:foo 2) '(#:bar 3 #:foo 42))
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=> (#:foo 42 #:bar 3)
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"
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(let loop ((args args)
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(kw/values kw/values)
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(result '()))
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(match args
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(()
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(append (reverse result) kw/values))
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((kw value rest ...)
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(match (memq kw kw/values)
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((_ value . _)
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(loop rest (delkw kw kw/values) (cons* value kw result)))
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(#f
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(loop rest kw/values (cons* value kw result))))))))
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;;;
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;;; System strings.
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;;;
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(define* (nix-system->gnu-triplet
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#:optional (system (%current-system)) (vendor "unknown"))
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"Return a guess of the GNU triplet corresponding to Nix system
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identifier SYSTEM."
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(match system
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("armhf-linux"
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(string-append "arm-" vendor "-linux-gnueabihf"))
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(_
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(let* ((dash (string-index system #\-))
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(arch (substring system 0 dash))
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(os (substring system (+ 1 dash))))
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(string-append arch
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"-" vendor "-"
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(if (string=? os "linux")
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"linux-gnu"
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os))))))
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(define (gnu-triplet->nix-system triplet)
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"Return the Nix system type corresponding to TRIPLET, a GNU triplet as
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returned by `config.guess'."
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(let ((triplet (cond ((string-match "^i[345]86-(.*)$" triplet)
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=>
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(lambda (m)
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(string-append "i686-" (match:substring m 1))))
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(else triplet))))
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(cond ((string-match "^arm[^-]*-([^-]+-)?linux-gnueabihf" triplet)
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"armhf-linux")
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((string-match "^([^-]+)-([^-]+-)?linux-gnu.*" triplet)
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=>
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(lambda (m)
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;; Nix omits `-gnu' for GNU/Linux.
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(string-append (match:substring m 1) "-linux")))
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((string-match "^([^-]+)-([^-]+-)?([[:alpha:]]+)([0-9]+\\.?)*$" triplet)
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=>
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(lambda (m)
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;; Nix strip the version number from names such as `gnu0.3',
|
||
;; `darwin10.2.0', etc., and always strips the vendor part.
|
||
(string-append (match:substring m 1) "-"
|
||
(match:substring m 3))))
|
||
(else triplet))))
|
||
|
||
(define %current-system
|
||
;; System type as expected by Nix, usually ARCHITECTURE-KERNEL.
|
||
;; By default, this is equal to (gnu-triplet->nix-system %host-type).
|
||
(make-parameter %system))
|
||
|
||
(define %current-target-system
|
||
;; Either #f or a GNU triplet representing the target system we are
|
||
;; cross-building to.
|
||
(make-parameter #f))
|
||
|
||
(define* (package-name->name+version spec
|
||
#:optional (delimiter #\@))
|
||
"Given SPEC, a package name like \"foo@0.9.1b\", return two values: \"foo\"
|
||
and \"0.9.1b\". When the version part is unavailable, SPEC and #f are
|
||
returned. Both parts must not contain any '@'. Optionally, DELIMITER can be
|
||
a character other than '@'."
|
||
(match (string-rindex spec delimiter)
|
||
(#f (values spec #f))
|
||
(idx (values (substring spec 0 idx)
|
||
(substring spec (1+ idx))))))
|
||
|
||
(define* (target-mingw? #:optional (target (%current-target-system)))
|
||
(and target
|
||
(string-suffix? "-mingw32" target)))
|
||
|
||
(define* (target-arm32? #:optional (target (or (%current-target-system)
|
||
(%current-system))))
|
||
(string-prefix? "arm" target))
|
||
|
||
(define* (target-aarch64? #:optional (target (or (%current-target-system)
|
||
(%current-system))))
|
||
(string-prefix? "aarch64" target))
|
||
|
||
(define* (target-arm? #:optional (target (or (%current-target-system)
|
||
(%current-system))))
|
||
(or (target-arm32? target) (target-aarch64? target)))
|
||
|
||
(define* (target-powerpc? #:optional (target (or (%current-target-system)
|
||
(%current-system))))
|
||
(string-prefix? "powerpc" target))
|
||
|
||
(define* (target-64bit? #:optional (system (or (%current-target-system)
|
||
(%current-system))))
|
||
(any (cut string-prefix? <> system) '("x86_64" "aarch64" "mips64" "powerpc64")))
|
||
|
||
(define* (cc-for-target #:optional (target (%current-target-system)))
|
||
(if target
|
||
(string-append target "-gcc")
|
||
"gcc"))
|
||
|
||
(define* (cxx-for-target #:optional (target (%current-target-system)))
|
||
(if target
|
||
(string-append target "-g++")
|
||
"g++"))
|
||
|
||
(define* (pkg-config-for-target #:optional (target (%current-target-system)))
|
||
(if target
|
||
(string-append target "-pkg-config")
|
||
"pkg-config"))
|
||
|
||
(define version-compare
|
||
(let ((strverscmp
|
||
(let ((sym (or (dynamic-func "strverscmp" (dynamic-link))
|
||
(error "could not find `strverscmp' (from GNU libc)"))))
|
||
(pointer->procedure int sym (list '* '*)))))
|
||
(lambda (a b)
|
||
"Return '> when A denotes a newer version than B,
|
||
'< when A denotes a older version than B,
|
||
or '= when they denote equal versions."
|
||
(let ((result (strverscmp (string->pointer a) (string->pointer b))))
|
||
(cond ((positive? result) '>)
|
||
((negative? result) '<)
|
||
(else '=))))))
|
||
|
||
(define (version-prefix version-string num-parts)
|
||
"Truncate version-string to the first num-parts components of the version.
|
||
For example, (version-prefix \"2.1.47.4.23\" 3) returns \"2.1.47\""
|
||
(string-join (take (string-split version-string #\.) num-parts) "."))
|
||
|
||
(define (version-major+minor+point version-string)
|
||
"Return \"major>.<minor>.<point>\", where major, minor and point are the
|
||
major, minor and point version numbers from the version-string. For example,
|
||
(version-major+minor+point \"6.4.5.2\") returns \"6.4.5\" or
|
||
(version-major+minor+point \"1.19.2-2581-324ca14c3003\") returns \"1.19.2\"."
|
||
(let* ((3-dot (version-prefix version-string 3))
|
||
(index (string-index 3-dot #\-)))
|
||
(or (false-if-exception (substring 3-dot 0 index))
|
||
3-dot)))
|
||
|
||
(define (version-major+minor version-string)
|
||
"Return \"<major>.<minor>\", where major and minor are the major and
|
||
minor version numbers from version-string."
|
||
(version-prefix version-string 2))
|
||
|
||
(define (version-major version-string)
|
||
"Return the major version number as string from the version-string."
|
||
(version-prefix version-string 1))
|
||
|
||
(define (version-unique-prefix version versions)
|
||
"Return the shortest version prefix to unambiguously identify VERSION among
|
||
VERSIONS. For example:
|
||
|
||
(version-unique-prefix \"2.0\" '(\"3.0\" \"2.0\"))
|
||
=> \"2\"
|
||
|
||
(version-unique-prefix \"2.2\" '(\"3.0.5\" \"2.0.9\" \"2.2.7\"))
|
||
=> \"2.2\"
|
||
|
||
(version-unique-prefix \"27.1\" '(\"27.1\"))
|
||
=> \"\"
|
||
"
|
||
(define not-dot
|
||
(char-set-complement (char-set #\.)))
|
||
|
||
(define other-versions
|
||
(delete version versions))
|
||
|
||
(let loop ((prefix '())
|
||
(components (string-tokenize version not-dot)))
|
||
(define prefix-str
|
||
(string-join prefix "."))
|
||
|
||
(if (any (cut string-prefix? prefix-str <>) other-versions)
|
||
(match components
|
||
((head . tail)
|
||
(loop `(,@prefix ,head) tail))
|
||
(()
|
||
version))
|
||
prefix-str)))
|
||
|
||
(define (version>? a b)
|
||
"Return #t when A denotes a version strictly newer than B."
|
||
(eq? '> (version-compare a b)))
|
||
|
||
(define (version>=? a b)
|
||
"Return #t when A denotes a version newer or equal to B."
|
||
(case (version-compare a b)
|
||
((> =) #t)
|
||
(else #f)))
|
||
|
||
(define (guile-version>? str)
|
||
"Return #t if the running Guile version is greater than STR."
|
||
;; Note: Using (version>? (version) "2.0.5") or similar doesn't work,
|
||
;; because the result of (version) can have a prefix, like "2.0.5-deb1".
|
||
(version>? (string-append (major-version) "."
|
||
(minor-version) "."
|
||
(micro-version))
|
||
str))
|
||
|
||
(define version-prefix?
|
||
(let ((not-dot (char-set-complement (char-set #\.))))
|
||
(lambda (v1 v2)
|
||
"Return true if V1 is a version prefix of V2:
|
||
|
||
(version-prefix? \"4.1\" \"4.16.2\") => #f
|
||
(version-prefix? \"4.1\" \"4.1.2\") => #t
|
||
"
|
||
(define (list-prefix? lst1 lst2)
|
||
(match lst1
|
||
(() #t)
|
||
((head1 tail1 ...)
|
||
(match lst2
|
||
(() #f)
|
||
((head2 tail2 ...)
|
||
(and (equal? head1 head2)
|
||
(list-prefix? tail1 tail2)))))))
|
||
|
||
(list-prefix? (string-tokenize v1 not-dot)
|
||
(string-tokenize v2 not-dot)))))
|
||
|
||
|
||
;;;
|
||
;;; Files.
|
||
;;;
|
||
|
||
(define (file-extension file)
|
||
"Return the extension of FILE or #f if there is none."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(and dot (substring file (+ 1 dot) (string-length file)))))
|
||
|
||
(define (file-sans-extension file)
|
||
"Return the substring of FILE without its extension, if any."
|
||
(let ((dot (string-rindex file #\.)))
|
||
(if dot
|
||
(substring file 0 dot)
|
||
file)))
|
||
|
||
(define (tarball-sans-extension tarball)
|
||
"Return TARBALL without its .tar.* or .zip extension."
|
||
(let ((end (or (string-contains tarball ".tar")
|
||
(string-contains tarball ".zip"))))
|
||
(substring tarball 0 end)))
|
||
|
||
(define (compressed-file? file)
|
||
"Return true if FILE denotes a compressed file."
|
||
(->bool (member (file-extension file)
|
||
'("gz" "bz2" "xz" "lz" "lzma" "tgz" "tbz2" "zip"))))
|
||
|
||
(define (switch-symlinks link target)
|
||
"Atomically switch LINK, a symbolic link, to point to TARGET. Works
|
||
both when LINK already exists and when it does not."
|
||
(let ((pivot (string-append link ".new")))
|
||
(symlink target pivot)
|
||
(rename-file pivot link)))
|
||
|
||
(define* (string-replace-substring str substr replacement
|
||
#:optional
|
||
(start 0)
|
||
(end (string-length str)))
|
||
"Replace all occurrences of SUBSTR in the START--END range of STR by
|
||
REPLACEMENT."
|
||
(match (string-length substr)
|
||
(0
|
||
(error "string-replace-substring: empty substring"))
|
||
(substr-length
|
||
(let loop ((start start)
|
||
(pieces (list (substring str 0 start))))
|
||
(match (string-contains str substr start end)
|
||
(#f
|
||
(string-concatenate-reverse
|
||
(cons (substring str start) pieces)))
|
||
(index
|
||
(loop (+ index substr-length)
|
||
(cons* replacement
|
||
(substring str start index)
|
||
pieces))))))))
|
||
|
||
(define (call-with-temporary-output-file proc)
|
||
"Call PROC with a name of a temporary file and open output port to that
|
||
file; close the file and delete it when leaving the dynamic extent of this
|
||
call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-file.XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(dynamic-wind
|
||
(lambda ()
|
||
#t)
|
||
(lambda ()
|
||
(proc template out))
|
||
(lambda ()
|
||
(false-if-exception (close out))
|
||
(false-if-exception (delete-file template))))))
|
||
|
||
(define (call-with-temporary-directory proc)
|
||
"Call PROC with a name of a temporary directory; close the directory and
|
||
delete it when leaving the dynamic extent of this call."
|
||
(let* ((directory (or (getenv "TMPDIR") "/tmp"))
|
||
(template (string-append directory "/guix-directory.XXXXXX"))
|
||
(tmp-dir (mkdtemp! template)))
|
||
(dynamic-wind
|
||
(const #t)
|
||
(lambda ()
|
||
(proc tmp-dir))
|
||
(lambda ()
|
||
(false-if-exception (delete-file-recursively tmp-dir))))))
|
||
|
||
(define (with-atomic-file-output file proc)
|
||
"Call PROC with an output port for the file that is going to replace FILE.
|
||
Upon success, FILE is atomically replaced by what has been written to the
|
||
output port, and PROC's result is returned."
|
||
(let* ((template (string-append file ".XXXXXX"))
|
||
(out (mkstemp! template)))
|
||
(with-throw-handler #t
|
||
(lambda ()
|
||
(let ((result (proc out)))
|
||
(fdatasync out)
|
||
(close-port out)
|
||
(rename-file template file)
|
||
result))
|
||
(lambda (key . args)
|
||
(false-if-exception (delete-file template))
|
||
(close-port out)))))
|
||
|
||
(define* (xdg-directory variable suffix #:key (ensure? #t))
|
||
"Return the name of the XDG directory that matches VARIABLE and SUFFIX,
|
||
after making sure that it exists if ENSURE? is true. VARIABLE is an
|
||
environment variable name like \"XDG_CONFIG_HOME\"; SUFFIX is a suffix like
|
||
\"/.config\". Honor the XDG specs,
|
||
<http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html>."
|
||
(let ((dir (and=> (or (getenv variable)
|
||
(and=> (or (getenv "HOME")
|
||
(passwd:dir (getpwuid (getuid))))
|
||
(cut string-append <> suffix)))
|
||
(cut string-append <> "/guix"))))
|
||
(when ensure?
|
||
(mkdir-p dir))
|
||
dir))
|
||
|
||
(define config-directory
|
||
(cut xdg-directory "XDG_CONFIG_HOME" "/.config" <...>))
|
||
|
||
(define cache-directory
|
||
(cut xdg-directory "XDG_CACHE_HOME" "/.cache" <...>))
|
||
|
||
(define (readlink* file)
|
||
"Call 'readlink' until the result is not a symlink."
|
||
(define %max-symlink-depth 50)
|
||
|
||
(let loop ((file file)
|
||
(depth 0))
|
||
(define (absolute target)
|
||
(if (absolute-file-name? target)
|
||
target
|
||
(string-append (dirname file) "/" target)))
|
||
|
||
(if (>= depth %max-symlink-depth)
|
||
file
|
||
(call-with-values
|
||
(lambda ()
|
||
(catch 'system-error
|
||
(lambda ()
|
||
(values #t (readlink file)))
|
||
(lambda args
|
||
(let ((errno (system-error-errno args)))
|
||
(if (or (= errno EINVAL))
|
||
(values #f file)
|
||
(apply throw args))))))
|
||
(lambda (success? target)
|
||
(if success?
|
||
(loop (absolute target) (+ depth 1))
|
||
file))))))
|
||
|
||
(define (canonical-newline-port port)
|
||
"Return an input port that wraps PORT such that all newlines consist
|
||
of a single linefeed."
|
||
(define (get-position)
|
||
(if (port-has-port-position? port) (port-position port) #f))
|
||
(define (set-position! position)
|
||
(if (port-has-set-port-position!? port)
|
||
(set-port-position! position port)
|
||
#f))
|
||
(define (close) (close-port port))
|
||
(define (read! bv start n)
|
||
(let loop ((count 0)
|
||
(byte (get-u8 port)))
|
||
(cond ((eof-object? byte) count)
|
||
;; XXX: consume all CRs even if not followed by LF.
|
||
((eqv? byte (char->integer #\return)) (loop count (get-u8 port)))
|
||
((= count (- n 1))
|
||
(bytevector-u8-set! bv (+ start count) byte)
|
||
n)
|
||
(else
|
||
(bytevector-u8-set! bv (+ start count) byte)
|
||
(loop (+ count 1) (get-u8 port))))))
|
||
(make-custom-binary-input-port "canonical-newline-port"
|
||
read!
|
||
get-position
|
||
set-position!
|
||
close))
|
||
|
||
;;;
|
||
;;; Source location.
|
||
;;;
|
||
|
||
(define absolute-dirname
|
||
;; Memoize to avoid repeated 'stat' storms from 'search-path'.
|
||
(mlambda (file)
|
||
"Return the absolute name of the directory containing FILE, or #f upon
|
||
failure."
|
||
(match (search-path %load-path file)
|
||
(#f #f)
|
||
((? string? file)
|
||
;; If there are relative names in %LOAD-PATH, FILE can be relative and
|
||
;; needs to be canonicalized.
|
||
(if (string-prefix? "/" file)
|
||
(dirname file)
|
||
(canonicalize-path (dirname file)))))))
|
||
|
||
(define-syntax current-source-directory
|
||
(lambda (s)
|
||
"Return the absolute name of the current directory, or #f if it could not
|
||
be determined."
|
||
(syntax-case s ()
|
||
((_)
|
||
(match (assq 'filename (or (syntax-source s) '()))
|
||
(('filename . (? string? file-name))
|
||
;; If %FILE-PORT-NAME-CANONICALIZATION is 'relative, then FILE-NAME
|
||
;; can be relative. In that case, we try to find out at run time
|
||
;; the absolute file name by looking at %LOAD-PATH; doing this at
|
||
;; run time rather than expansion time is necessary to allow files
|
||
;; to be moved on the file system.
|
||
(if (string-prefix? "/" file-name)
|
||
(dirname file-name)
|
||
#`(absolute-dirname #,file-name)))
|
||
((or ('filename . #f) #f)
|
||
;; raising an error would upset Geiser users
|
||
#f))))))
|
||
|
||
|
||
;;;
|
||
;;; String comparison.
|
||
;;;
|
||
|
||
(define (string-distance s1 s2)
|
||
"Compute the Levenshtein distance between two strings."
|
||
;; Naive implemenation
|
||
(define loop
|
||
(mlambda (as bt)
|
||
(match as
|
||
(() (length bt))
|
||
((a s ...)
|
||
(match bt
|
||
(() (length as))
|
||
((b t ...)
|
||
(if (char=? a b)
|
||
(loop s t)
|
||
(1+ (min
|
||
(loop as t)
|
||
(loop s bt)
|
||
(loop s t))))))))))
|
||
|
||
(let ((c1 (string->list s1))
|
||
(c2 (string->list s2)))
|
||
(loop c1 c2)))
|
||
|
||
(define* (string-closest trial tests #:key (threshold 3))
|
||
"Return the string from TESTS that is the closest from the TRIAL,
|
||
according to 'string-distance'. If the TESTS are too far from TRIAL,
|
||
according to THRESHOLD, then #f is returned."
|
||
(identity ;discard second return value
|
||
(fold2 (lambda (test closest minimal)
|
||
(let ((dist (string-distance trial test)))
|
||
(if (and (< dist minimal) (< dist threshold))
|
||
(values test dist)
|
||
(values closest minimal))))
|
||
#f +inf.0
|
||
tests)))
|
||
|
||
;;; Local Variables:
|
||
;;; eval: (put 'call-with-progress-reporter 'scheme-indent-function 1)
|
||
;;; End:
|